N-fluorenyl n-alkyl beta-haloalkyl amines



Patented Oct. 30, 1951 I UNITED ST ATES PATENT OFFlCE N-FLUOR IENYL fi-HALOALKYL George Rieveschl, J r., Grosse Pointe Woods, Mich., assignor to Parke, Davis & Company, Detroit, Mich., a corporation of Michigan No Drawing. Application April 11, 1949, Serial No. 86,870

11 Claims. (Cl. 260-576) 1 2 This invention relates to a new class of tertiary Example 1.9-fluorenyl methyl p-chloo'oethyl amines and to methods for obtaining the same. amine More specifically, the invention relates tosubstituted 9-fiuorenyl p-haloalkyl amines and their acid addition salts. The free bases of the compounds of the present invention have the formula,

R Q I 10 35 g. of 9-fluorenyl methyl fl-hydroxyethyl EI-N-CHzCEFX amine dissolved in dry ether is added slowly to 1 25 cc. of thionyl chloride. Afterthe addition has been completed, the reaction mixture is heated on the steam bath for ten minutes and the resulting mixture evaporated to dryness in vacuo. The

where R is a lower alkyl or lower alkenyl radical,

R1 s hydrogen or methyl and X is chlorine or residue which is an oil is washed in anhydrous bromme atom. ether and then taken up in boiling isopropanol.

It has been discovered that the comP l1 d 0f On cooling the crystalline hydrochloride of 9- the invention may be obtained by the action of fi orenyl methyl phloroethyl amine separates. a halogen ag on a Compound of the Recrystallization from isopropanol yields the pure mula, I products; M. P. 183 C. with decomposition.

. Example '2.9-fluorenyl ethyl p-chloroethyl R amine \CH-I1ICHZCHOH zCHa where R and R have the same significance as given above. Some of the halogenating agents which may be used to effect this transformation About g. of o-fiuorenyl ethyl fl-hydroxyethyl are thionyl chloride, thionyl bromide; constant amine dissolved in ether is added with cooling boiling hydrobromic acid, phosphorus oxychloto 50 cc. of thionyl chloride. The excess thionyl ride, phosphorus oxybromide, phosphorus trichloride and ether are evaporated on a steam chloride, phosphorus tribromide, phosphorus bath and the reaction mixture diluted with an pentachloride and the like. The reaction may be 35 hydrous ether. The crystalline hydrochloride salt carried out by heating the two reactants for a of 9-fluorenyl ethyl B-chloroethyl amine is collectshort time in the presence or absence of a solvent. ed and purified by recrystallization fromiso- In some cases, such as when phosphorus oxychlopropanol; M. P. 198 C. with decomposition. ride or constant boiling hydrobromic acid is used as the halogenating agent, an excess of the 40 amine reagent serves both as a solvent and as a reactant. 7 When halogenating agents such as thionyl chloride and thionyl bromide are used, it is preferable to carryout the reaction in an inert organic sol- I CHN-CH2CHiBr vent such as benzene, toluene or xylene.

The compounds of the presentinvention are powerful sympatholytic agents and because of this ability to block the pressor efiect of epi- A mixture consistin of 26 g. of 9-fluore'nyl nephrine they are especially useful in peripheral ethyl B-hydroxyethyl amine and 300 g. of convasculardiseases and neurogenic hypertension. stant boiling hy c cid iS refluxed for They may be administered preferably as the salts an hour. Most of the hydrobromic acid is reof the free bases either orally or intravenously. moved by distillation and the residue cooled. The usual intravenous dosage is about 100-200 Acetone is added to the residue and the crystalline m'g. while the' oral dosage is about 1 50-.-300 mg: hydrobromide salt of Q-fluorenylethyl p-bromo- The invention is illustrated by the-following ethyl amine which separates collected and puriexamples. fiedby recrystallization from isopropanol.

Example 3.--9fluorenyl ethyl p-b'romoethyl I of benzene.

. 3 Example 4.9-fluorenyl n propyl p-chloroethyl amine i H2 CH2 CH3 CH-NCH2 CH2 C1 25 g. of 9-fluorenyl n-propyl [3-hydroxyethyl amine dissolved in 50 cc. of toluene is added slowly to a refluxing solution 0112 cc. of thionyl chloride in 50 cc. of toluene. After the addition is complete the mixture is refluxed for one hourand then approximately one-half of the toluene 4 amine dissolved in ether is added to 25 cc. of thionyl chloride. The resulting reaction mixture is heated on a steam bath for about fifteen minutes whereupon an oil which has previously separated crystallizes. The crystals are collected, washedwith a small amount of ether and puri-= fled by recrystallization from isopropanol. The product thus obtained is the'hydrochloride salt of Q-fluorenyl n-butyl fi-chloroethyl amine.

distilled off in vacuo. The distillation residue is I treated with ether and the crystalline hydrochloride salt of Q-fluorenyl n-propyl ,B-chloroethyl amine removed by filtration. The crude product can be purified, if desired, by recrystallizationfrom'acetone eth'yl acetate mixture or from isopropanol.

Example 5.-9-fluorenyl isopropyl ,B-chloroethyl amine Anether solution containing about of 9 fluorenyl isopropyl fi-hydroxyethyl amine is added slowly to cc. of thionyl chloride with cooling. :The resulting mixture is heated on a steam bath for fifteen minutes and the reaction mixture treated with 10 cc. of methanol to re-' move the excess thionyl chloride. The reaction mixture is evaporated almost to dryness, the residue treated With anhydrous ether and the crystalline hydrochloride salt of Q-fluorenyl isopropyl fi-chloroethyl amine collected. Recrystallization from absolute ethanol yields the pure compound in the form of colorless crystals melting at 217 C. with decomposition.

Example 6.-9- fluorenyl allyl 'fl-chloroethyl amine 26 g. of 9-fluorenyl allyl fl-hydroxyethyl amine dissolved in cc. of benzene is added dropwise to 12 cc. of thionyl chloride dissolvedin 50 cc. After the addition is complete the mixture is refluxed for about one hour and then the benzene distilled oil in vacuo. The residue is stirred with etherand "the crystalline hydrochloride salt of 9-fluorenyl allyl B-chloroethyl amine collected and purified by recrystallization from isopropanol or isopropanol-acetone mixture.

Example 7.--9-fluorenyl n-butyl fl-chloroethyl amine V V Example 8.9-fluorenyl n-hezcyl e-chloroeahyl amine 30 g. of Q-fluorenyl n-hexyl fi-hydroxyethyl amine is dissolved in 50 cc. of benzene and the resulting solution added dropwise to 13 cc. of

thionyl chloride in :50 cc. of benzene. After the addition has been completed the reactioninixture is refluxed for one hour and then the benzene distilled off in vacuo. {The residue is stirred -w;ith ether until it crystallizes and the crystalline hy-' drochloride salt of Q-fluorenyl n-hexyl fl-chloroethyl amine collected and purified by recrystallization from isopropanol or isopropanol-ether mixture.

Example 9.9-fluorenyl methyl p-bromopropyl amine 7 Example 1'0.9-fluoenyl allyl p-chloropr'opyl amine OHZCH=CH2 28 g. of 9-fluorenyl allyl fihydroxypro'pyl amine 'in50 cc. of benzene is-added slowly to *a solution of 13cc. of thionyl chloride in '50 cc. of xylene. The resulting mixture is refluxed for'one hour, the xylene distilled off in vacuo and the residue stirred with 500 cc. of dry ether. The crystalline hydrochloride salt of 9-flu0renyl allyl 8- chloropropyl amine is collected and purified by recrystallization from isopropanol.

While the above examples deal primarily with the production of the hydroh alide salts of the.

new 9-fluorenyl p-haloallgylamines, it shouldbe understood thatithe invention also includes other acid addition salts "of inorganic and organic acids. Some of these other salts are the citrate, benzoate, acetate, oxalate, tartrate, sulfate, phosphate and the like. These salts may be prepared from the free base of the new tertiary amines. For example, the citrate salt of 9-fluorenyl methyl ,B-chloroethyl amine, the compound of Example 1, may be prepared as follows: 25 g. of Q-fiuorenyl methyl ,B-chloroethy1 amine hydrochloride is dissolved in 150 cc. of water and the resulting solution made alkaline in the cold by the addition of 10% sodium hydroxide solution. The free base is extracted from the alkaline solution with ether, the combined ether extracts dried for a few minutes over anhydrous potassium carbonate and the drying agent removed by filtration. The ether solution of the free base is added to a solution of 17 g. of citric acid in 500 cc. of ether (plus a small amount of absolute ethanol to increase the solubility of the citric acid). The citrate salt which separates from the solution as a fine white powder is collected and purified by repeated washing with ether.

Other salts such as the oxalate of 9-fluorenyl methyl fi-chloroethyl amine may be prepared by evaporation of the ether from a solution of the free base and adding the base to a warm solution of isopropanol containing at least one equivalent of oxalic acid. Ethyl acetate is added and on cooling the acid oxalate of 9-f1uoroenyl methyl ,3- chloroethyl amine crystallizes out.

In its broader aspects the invention also includes the quaternary ammonium compounds derived from the 9-fluorenyl ,B-haloalkyl amines. The quaternary ammonium halides can be prepared by treating the iree base of a Q-fluorenyl fl-haloalkyl amine with an alkyl or aralkyl halide such as methyl iodide, ethyl bromide, benzochloride and the like in an inert organic solvent. The quaternary ammonium sulfonates and sulfates can be prepared in an analogous manner by using reagents such as dimethyl sulfate, methyl benzene sulfonate and methyl p-toluene sulfonate instead of the alkyl or aralkyl halides. Some examples of the compounds which can be prepared by these methods are 9-flu0renyl dimethyl fl-chloroethy1 ammonium iodide, 9- fluorenyl ethyl B-chloropropylmethyl ammonium benzene sulfonate, 9-fluorenyl diethyl fi-chloroethyl ammonium p-toluene sulfonate, 9-fluorenyl dimethyl p-chloroethyl ammonium methyl sulfate and 9-fluoreny1 ethyl b-chloroethyl benzyl ammonium chloride.

The substituted -9-fiuorenyl fl-hydroxyalkyl amines used as starting materials for the preparation of the new halo amines of the present invention may be prepared as described in my copending application, Serial Number 86,869, filed on even date herewith.

What I claim as my invention is:

1. A compound of the class consisting of a free base and its acid addition salts, said free base having the formula,

where R is a member of the class consisting of lower alkyl and allyl radicals, R1 is a member of the class consisting of hydrogen and methyl and X is a member of the class consisting of chlorine and bromine.

2. A compound of the class consisting of a free base and its acid addition salts, said free base having the formula,

where R is lower alkyl, R1 is a member of the class consisting of hydrogen and methyl and X is a member of the class consisting of chlorine and bromine.

3. An acid addition salt of a compound of formula,

where R is a lower alkyl radical.

4. An acid addition salt of a compound of formula,

where R is a lower alkyl radical.

5. A hydrochloride salt of a compound of formula,

UgU

where R is a lower alkyl radical.

6. A hydrobromide salt of a compound of formula,

fl-chloroethyl amine GEORGE RIEVESCHL, JR.

No references cited. 

1. A COMPOUND OF THE CLASS CONSISTING OF A FREE BASE AND ITS ACID ADDITION SALTS, SAID FREE BASE HAVING THE FORMULA, 